App: Add class CleanupProcess to allow to free resources when closing the application

src/App/Application.cpp

@@ -84,6 +84,7 @@
 
 #include "Annotation.h"
 #include "Application.h"
+#include "CleanupProcess.h"
 #include "ComplexGeoData.h"
 #include "DocumentObjectFileIncluded.h"
 #include "DocumentObjectGroup.h"
@@ -1699,6 +1700,8 @@ void Application::destruct()
     cleanupUnits();
 #endif
 
+    CleanupProcess::callCleanup();
+
     // not initialized or double destruct!
     assert(_pcSingleton);
     delete _pcSingleton;